2-Methoxy-4-[1-hydroxy-2-(isopropylamino)ethyl]phenol 4-Hydroxy-3-methoxy-α-[[(1-methylethyl)amino]methyl]benzenemethanol α-[(Isopropylamino)methyl]vanillyl alcohol Metiprenaline Isoprenaline Impurity 3 4-[1-hydroxy-2-(propan-2-ylamino)ethyl]-2-methoxyphenol 4-(1-Hydroxy-2-(isopropylamino)ethyl)-2-methoxyphenol Egyt 402